//===-- CommandHistory.cpp --------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include <inttypes.h>

#include "lldb/Host/StringConvert.h"
#include "lldb/Interpreter/CommandHistory.h"

using namespace lldb;
using namespace lldb_private;

CommandHistory::CommandHistory() : m_mutex(), m_history() {}

CommandHistory::~CommandHistory() {}

size_t CommandHistory::GetSize() const {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  return m_history.size();
}

bool CommandHistory::IsEmpty() const {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  return m_history.empty();
}

const char *CommandHistory::FindString(const char *input_str) const {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  if (!input_str)
    return nullptr;
  if (input_str[0] != g_repeat_char)
    return nullptr;
  if (input_str[1] == '-') {
    bool success;
    size_t idx = StringConvert::ToUInt32(input_str + 2, 0, 0, &success);
    if (!success)
      return nullptr;
    if (idx > m_history.size())
      return nullptr;
    idx = m_history.size() - idx;
    return m_history[idx].c_str();

  } else if (input_str[1] == g_repeat_char) {
    if (m_history.empty())
      return nullptr;
    else
      return m_history.back().c_str();
  } else {
    bool success;
    uint32_t idx = StringConvert::ToUInt32(input_str + 1, 0, 0, &success);
    if (!success)
      return nullptr;
    if (idx >= m_history.size())
      return nullptr;
    return m_history[idx].c_str();
  }
}

const char *CommandHistory::GetStringAtIndex(size_t idx) const {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  if (idx < m_history.size())
    return m_history[idx].c_str();
  return nullptr;
}

const char *CommandHistory::operator[](size_t idx) const {
  return GetStringAtIndex(idx);
}

const char *CommandHistory::GetRecentmostString() const {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  if (m_history.empty())
    return nullptr;
  return m_history.back().c_str();
}

void CommandHistory::AppendString(const std::string &str, bool reject_if_dupe) {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  if (reject_if_dupe) {
    if (!m_history.empty()) {
      if (str == m_history.back())
        return;
    }
  }
  m_history.push_back(std::string(str));
}

void CommandHistory::Clear() {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  m_history.clear();
}

void CommandHistory::Dump(Stream &stream, size_t start_idx,
                          size_t stop_idx) const {
  std::lock_guard<std::recursive_mutex> guard(m_mutex);
  stop_idx = std::min(stop_idx + 1, m_history.size());
  for (size_t counter = start_idx; counter < stop_idx; counter++) {
    const std::string hist_item = m_history[counter];
    if (!hist_item.empty()) {
      stream.Indent();
      stream.Printf("%4" PRIu64 ": %s\n", (uint64_t)counter, hist_item.c_str());
    }
  }
}
